README.md: Update out-of-date info
README.md: Update out-of-date info

Adjust the contributions information with up-to-date information. Also
change dependency info to match new branching strategy for Technux
forked repos.

Change-Id: I0412cd32bbbacf1ee47a132e172ca73299b49d69
Signed-off-by: Petter Mabäcker <776ff2f1d6672e460d89332fc27e3218020bdf83@technux.se>

Technux/meta-technux,Technux/meta-technux